1 / 23

ФИЗИКО-ХИМИЧЕСКИЕ ОСНОВЫ НАНОТЕХНОЛОГИИ

ФИЗИКО-ХИМИЧЕСКИЕ ОСНОВЫ НАНОТЕХНОЛОГИИ. Профессор Н.Г. Рамбиди. 5. Атомный дизайн. What is Scanning Tunneling Microscopy?. Allows for the imaging of the surfaces of metals and semiconductors at the atomic level.

chaz
Download Presentation

ФИЗИКО-ХИМИЧЕСКИЕ ОСНОВЫ НАНОТЕХНОЛОГИИ

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. ФИЗИКО-ХИМИЧЕСКИЕ ОСНОВЫ НАНОТЕХНОЛОГИИ Профессор Н.Г. Рамбиди

  2. 5. Атомный дизайн

  3. What is Scanning Tunneling Microscopy? Allows for the imaging of the surfaces of metals and semiconductors at the atomic level. Developed by Gerd Binnig and Heinrich Rohrer at the IBM Zurich Research Laboratory in 1982. Binnig Rohrer The two shared half of the 1986 Nobel Prize in physics for developing STM. STM has fathered a host of new atomic probe techniques: Atomic Force Microscopy, Scanning Tunneling Spectroscopy, Magnetic Force Microscopy, Scanning Acoustic Microscopy, etc.

  4. e- piezo-element e- e- e- nA e- < 1nm e- e- R e- e- STM: scanning tunneling microscope tunneling of electrons through air between probe and surface probe x-y stage only conducting material

  5. Basic Principles of STM Bias voltage: mV – V range d ~ 6 Å Electrons tunnel between the tip and sample, a small current I is generated (10 pA to 1 nA). I proportional to e-2κd, I decreases by a factor of 10 when d is increased by 1 Å.

  6. Usually, constant current mode is superior. Two Modes of Scanning Constant Height Mode Constant Current Mode

  7. STM изображения

  8. Examples of STM images… • Pt (100) with vaccancies • Si (111) 7x7 reconstruction • Annealed decanethiol film on Au(111) • Si (111) with terraces and vaccancies

  9. Бранденбургские ворота

  10. Диффузия атомов на поверхности

  11. Атомно-молекулярный дизайн

  12. Смещение атомов по поверхности

  13. Moving atoms one at a time…

  14. Создание треугольной системы атомов

  15. Смещение молекулы иодбензола

  16. Смещение молекул на поверхности

  17. Разложение молекул

  18. Диссоциация

  19. Иодбензол

  20. P-дииодбензол

  21. Реакция Ульмана

  22. Реакция Ульмана

  23. Молекулярное конструирование

More Related